/*******************************************************************************
 * Copyright 2011 Netflix
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.netflix.astyanax.connectionpool;

/**
 * Interface for algorithm to detect when a host is considered down. Once a host
 * is considered to be down it will be added to the retry service
 * 
 * @author elandau
 * 
 */
public interface BadHostDetector {
    public interface Instance {
        /**
         * Add a timeout sample and return false if the host should be
         * quarantined
         * 
         * @return true to quarantine or false to continue using this host
         */
        boolean addTimeoutSample();
    }

    Instance createInstance();

    void removeInstance(Instance instance);
}
